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Structure and Properties of Amino Acids

Structure and Properties of Amino Acids
The α-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .

2.2, and 9.4
6.5, and 8.0
1.1, and 12.1
3.3, and 10.5

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Structure and Properties of Amino Acids
Stereo chemical configuration of all a-amino acids derived from proteins is

L
L and D
D
None of these

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Structure and Properties of Amino Acids
Serine and threonine are polar amino acids due to

reactive aldehyde group in the side chain
reactive hydroxyl group in the side chain
reactive alcoholic group in the side chain
reactive keto group in the side chain

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Structure and Properties of Amino Acids
How many different amino acids are there?

3
100
20
An infinite number

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Structure and Properties of Amino Acids
Which pair of amino acids absorbs the most UV light at 280 nm?

Trp & Tyrosine
Cystein & Asparagine
Phenylalnine & Proline
Threonine & Histidine

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Structure and Properties of Amino Acids
The sequence of letters 'WYQN' will represent

Tryptophan, tyrosine, glutamic acid, asparagine
Tryptophan, tyrosine, glutamine, asparagine
Glutamine, tyrosine, tryptophan, aspartic acid
Tryptophan, glutamine, tryptophan, asparagine

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